// Copyright (c) 2020-present The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <key.h>

#include <secp256k1.h>

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

#include <test/util/random.h>

#include <cstdint>

#include <vector>

bool SigHasLowR(const secp256k1_ecdsa_signature* sig);

int ecdsa_signature_parse_der_lax(secp256k1_ecdsa_signature* sig, const unsigned char* input, size_t inputlen);

FUZZ_TARGET(secp256k1_ecdsa_signature_parse_der_lax)

{

    SeedRandomStateForTest(SeedRand::ZEROS);

    FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};

    const std::vector<uint8_t> signature_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider);

    if (signature_bytes.data() == nullptr) {

        return;

    }

    secp256k1_ecdsa_signature sig_der_lax;

    const bool parsed_der_lax = ecdsa_signature_parse_der_lax(&sig_der_lax, signature_bytes.data(), signature_bytes.size()) == 1;

    if (parsed_der_lax) {

        ECC_Context ecc_context{};

        (void)SigHasLowR(&sig_der_lax);

    }

}